In The Aging Process and How We Can Help Older Dogs Adapt, we explain some of the more common and normal changes we can see in the function of the various organ systems in an older dog. Many of these changes are expected. Disease can occur, however, if these changes become severe and the organ or system is no longer able to compensate. The more common diseases seen in older dogs and the signs of these diseases are listed in the table below. Most of the diseases are discussed in detail in separate articles, just one click away.

Common Diseases in Older Dogs

Signs and Symptoms of Disease

Cancer

Abnormal swellings that persist or continue to grow
Sores that do not heal
Weight loss
Loss of appetite
Bleeding or discharge from any body opening
Offensive odor
Difficulty eating or swallowing
Hesitation to exercise or loss of stamina
Difficulty breathing, urinating, or defecating